feat: update minishlink/web-push (#55)

Author: bpolaszek

composer.json

@@ -16,7 +16,7 @@
         "ext-mbstring": "*",
         "ext-openssl": "*",
         "guzzlehttp/guzzle": "^6.5.8 || ^7.4",
-        "minishlink/web-push": "^6.0.7 || ^7.0 || ^8.0",
+        "minishlink/web-push": "^6.0.7 || ^7.0 || ^8.0 || ^9.0",
         "symfony/http-kernel": "^5.4.20 || ^6.0 || ^7.0"
     },
     "require-dev": {